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java.lang.AssertionError: Unknown credential type configured: null	at jenkins.plugins.openstack.compute.JCloudsSlaveTemplate.get(JCloudsSlaveTemplate.java:230)	at jenkins.plugins.openstack.compute.JCloudsSlaveTemplate.provisionSlave(JCloudsSlaveTemplate.java:164)	at jenkins.plugins.openstack.compute.JCloudsCloud$2.call(JCloudsCloud.java:221)	at jenkins.plugins.openstack.compute.JCloudsCloud$2.call(JCloudsCloud.java:218)	at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)